Exhaust-pipe for locomotives



(No Model.)

J. B. HARTIGAN.

I EXHAUST PIPE FOR LOOOMOTIVBSY. No. 496,410. Patented Ma 2, 1893.

WITNESSES: kIVEN FORI @K@WMW j 4'4 ATTORNEYS.

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Nrrnc STATES EXHAUST-PIPE FOR LOCOMOTIVES.

SPECIFICATION forming part of Letters Patent No. 496,410, dated May 2, 1893.

Application filed October 22,1892. Serial No. 449,623- (No model.)

To all whom it may concern Be it known that I, JAMES B. HARTIGAN, of Oswego,in the conntyof Oswego,in the State of New York,have invented new and useful Improvements in Exhaust-Pipes for Locomotives and Analogous Engines, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to the class of appliances which are connected to the exhaustpipes of locomotives for the purpose of relieving the piston of the engine from back-pressure due to the contraction of the nozzle of the exhaust-pipe. And it consists in animproved construction and combination of parts whereby a part of the exhaust-steam is caused to escape from the base of the-exhaust-pipe and conducted through a constantly open pipe into a reservoir or chamber which is heated by the products of combustion surrounding itand from whence it returns to the same portion of the exhaust-pipe and thence escapes by its own pressure therefrom and follows the preceding portion of the exhauststeam through the exhaust-pipe during the period in which the steam is cut off from said pipe by the valve of the engine. The exhaust-pipe thus receives a secondary charge of steam between the exhausts from the cylinder and causes nearly a continuous exhaust through the pipe, said continuous or nearly contin nous exhaust through the exhaust-pipe producing a nearly continuous and uniform draftthrough the fire-box and thus increasing the efficiency of the engine. And the invention also consists in the connection, with the aforesaid chamber, of the exhaust-pipe of the air pump, the escape of the steam of which is thereby muiiied, all as hereinafter more fully described and specifically set forth in the claims.

In the annexed drawings Figure 1 is a longitudinal section of that portion of a locomotive to which my invention is applied, and Fig. 2 is a transverse section on line at, w, in Fig. 1.

Similar letters of reference indicate corresponding parts.

A- represents the so-called smoke-box of a locomotive boiler.

B denotes the exhaust-pipe which is arranged vertically in the smoke-box to conduct the exhaust steam through the same and is provided on its upper end with the nozzle -O by which the exhaust-steam is directed into the smoke-stack D- in the usual and well known manner. Upon the bottom of the interior of the smoke-box I mount the chamber or reservoir R- which communicates with the exhaust-pipe by a constantly open pipe or pipes c. Said chamber is divided into two compartments, each ofwhich communicates with the exhaust passages of one of the cylinders of the engine by way of the exhaust- 55 pipe. The exhaust steam is usually checked to some extent by the reduced diameter of the nozzle O- and to relieve the exhaustpipe from the checked steam, exits for said steam have heretofore been provided at the top of the exhaust-pipe and allowed to escape either through an additional pipe, or through the nozzle of the companion exhaust-pipe, hence none of the exhaust steam is stored in either case.

In my present invention part of the exhaust steam is intercepted near the base of the pipe by the chamber or reservoir R and its pipe -0 tapping the exhaust pipe at the aforesaid point. Said chamber being located in the smoke-boxand heatedby the products of combustion entering said smoke-box.effectu-. ally prevents condensation of the steam in said chamber and as soon as the pipe B is sufficiently relieved from pressure of the direct exhaust, the steam in the chamber -R escapes by its own pressure'into the pipe B- and follows the preceding portion of the exhaust steam through said pipe to the smoke-stack D,and thus produces nearly 0 a continuous exhaust as aforesaid. I also utilize said chamber for muffling the exhaust of the air-pump of the air-brake, by extending the steam exhaust pipe -a of said pump into the chamber R and thus sep- 5 arating it from the direct exhaust through the pipe B-- as represented in Fig. 1 of the drawings. In addition to this effect the ad mission of the exhaust-steam from the pipe -Ct into the chamber Rand thenceinto the exhaust pipe While the engine is standing still heats the exhaust passages of the cylinder and thus obviates in a great measure condensation of the exhaust-steam when the englue is not in motion.

Having described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. The combination With the smoke-box -A and the exhaust-pipe --B- located in and conducting the exhaust steam through said smoke-box as shown, of the chamber -R also in the smoke-box to be heated by the products of combustion entering the same, and the constantly and invariably open pipe -c connecting the said chamber to the pipe B near the base thereof, to permit part of the exhaust steam to enter said chamber and subsequently escape by its own pressure through the pipe -c and follow the preceding portion of the exhaust steam through the exhaust pipe -B-, substantially as set forth.

2. In combination with the smoke-box A- and exhaust-pipe -B, the chamber R located in the smoke-box to be heated by the products of combustion, the constantly open pipe cextending from the said chamber to the lower portion of the exhaust-pipe and charging the chamber with low pressuresteam, and the exhaust pipe a of the air pump extending into said chamber to be separated from the directexhaustthrough the pipe B and muffle the steam escaping from the pipe a, substantially as set forth.

In testimony whereof I have hereunto signed my name this 17th day of October, 1892.

JAMES B. I'IARTIGAN. [L.

\Vitnesses:

H. M. SEAMANS, J. J. LAASS. 

